<?php

/*
	Question2Answer (c) Gideon Greenspan

	http://www.question2answer.org/

	
	File: qa-include/qa-app-search.php
	Version: See define()s at top of qa-include/qa-base.php
	Description: Wrapper functions and utilities for search modules


	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.
	
	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	More about this license: http://www.question2answer.org/license.php
*/

if (!defined('QA_VERSION')) { // don't allow this page to be requested directly from browser
    header('Location: ../');
    exit;
}


function qa_get_search_results($query, $start, $count, $userid, $absoluteurls, $fullcontent)
    /*
        Returns $count search results for $query performed by $userid, starting at offset $start. Set $absoluteurls to true
        to get absolute URLs for the results and $fullcontent if the results should include full post content. This calls
        through to the chosen search module, and performs all the necessary post-processing to supplement the results for
        display online or in an RSS feed.
    */
{

    //	Identify which search module should be used

    $searchmodules = qa_load_modules_with('search', 'process_search');

    if (!count($searchmodules))
        qa_fatal_error('No search engine is available');

    $module = reset($searchmodules); // use first one by default

    if (count($searchmodules) > 1) {
        $tryname = qa_opt('search_module'); // use chosen one if it's available

        if (isset($searchmodules[$tryname]))
            $module = $searchmodules[$tryname];
    }

    //	Get the results

    $results = $module->process_search($query, $start, $count, $userid, $absoluteurls, $fullcontent);

    //	Work out what additional information (if any) we need to retrieve for the results

    $keypostidgetfull = array();
    $keypostidgettype = array();
    $keypostidgetquestion = array();
    $keypageidgetpage = array();

    foreach ($results as $result) {
        if (isset($result['question_postid']) && !isset($result['question']))
            $keypostidgetfull[$result['question_postid']] = true;

        if (isset($result['match_postid'])) {
            if (!((isset($result['question_postid'])) || (isset($result['question']))))
                $keypostidgetquestion[$result['match_postid']] = true; // we can also get $result['match_type'] from this

            elseif (!isset($result['match_type']))
                $keypostidgettype[$result['match_postid']] = true;
        }

        if (isset($result['page_pageid']) && !isset($result['page']))
            $keypageidgetpage[$result['page_pageid']] = true;
    }

    //	Perform the appropriate database queries

    list($postidfull, $postidtype, $postidquestion, $pageidpage) = qa_db_select_with_pending(
        count($keypostidgetfull) ? qa_db_posts_selectspec($userid, array_keys($keypostidgetfull), $fullcontent) : null,
        count($keypostidgettype) ? qa_db_posts_basetype_selectspec(array_keys($keypostidgettype)) : null,
        count($keypostidgetquestion) ? qa_db_posts_to_qs_selectspec($userid, array_keys($keypostidgetquestion), $fullcontent) : null,
        count($keypageidgetpage) ? qa_db_pages_selectspec(null, array_keys($keypageidgetpage)) : null
    );

    //	Supplement the results as appropriate

    foreach ($results as $key => $result) {
        if (isset($result['question_postid']) && !isset($result['question']))
            if (@$postidfull[$result['question_postid']]['basetype'] == 'Q')
                $result['question'] = @$postidfull[$result['question_postid']];

        if (isset($result['match_postid'])) {
            if (!((isset($result['question_postid'])) || (isset($result['question'])))) {
                $result['question'] = @$postidquestion[$result['match_postid']];

                if (!isset($result['match_type']))
                    $result['match_type'] = @$result['question']['obasetype'];

            } elseif (!isset($result['match_type']))
                $result['match_type'] = @$postidtype[$result['match_postid']];
        }

        if (isset($result['question']) && !isset($result['question_postid']))
            $result['question_postid'] = $result['question']['postid'];

        if (isset($result['page_pageid']) && !isset($result['page']))
            $result['page'] = @$pageidpage[$result['page_pageid']];

        if (!isset($result['title'])) {
            if (isset($result['question']))
                $result['title'] = $result['question']['title'];
            elseif (isset($result['page']))
                $result['title'] = $result['page']['heading'];
        }

        if (!isset($result['url'])) {
            if (isset($result['question']))
                $result['url'] = qa_q_path($result['question']['postid'], $result['question']['title'],
                    $absoluteurls, @$result['match_type'], @$result['match_postid']);
            elseif (isset($result['page']))
                $result['url'] = qa_path($result['page']['tags'], null, qa_opt('site_url'));
        }

        $results[$key] = $result;
    }

    //	Return the results

    return $results;
}


/*
	Omit PHP closing tag to help avoid accidental output
*/